Passo di Collerena - Sandbüheljoch

Overview

The Passo di Collerena - Sandbüheljoch is a short climb only on paper. Across 6.1 km it averages a savage 10.38%, hauling you from a start elevation of 847 m up to a summit of 1480 m. That is 633 m of net elevation gain packed into a distance most riders could cover on the flat in twelve minutes. Here, it will take far longer, and it will hurt.

With an average that steep and a max of 15.13%, this is a genuine Category 1 ascent — one rung below hors catégorie and every bit as demanding on its worst ramps. There is nowhere to hide, no valley kilometre to inflate the distance and soften the average. What you see is what you climb: relentless, sustained steepness from bottom to top.

How the Gradient Unfolds

The defining feature of this climb is consistency of pain. A 10.38% average over 6.1 km means the road rarely dips below double digits, and the 15.13% max tells you where the true teeth are. The gap between average and maximum is under five percentage points, which signals a climb without long recovery flats — the hard sections are only a little harder than the baseline, and the baseline is already brutal.

Note too that the total ascent of 617 m is slightly less than the net gain of 633 m. That is a clue the road climbs almost monotonically, with no meaningful descents to give your legs a break before the next ramp. Every metre you earn, you keep. Plan for a wall that simply keeps rising toward 1480 m.

Pacing Notes

On a climb this steep, pacing is survival. The temptation is to attack the lower slopes; resist it. At an average of 10.38%, going even slightly too hard early will cost you dearly before the summit.

Anchor your effort to your FTP. Most riders can hold a sustained climb of roughly this duration near threshold, but the 15.13% pitches will force short surges above it — so bank a little headroom rather than riding pinned from the base. If you do not know your threshold, run the numbers first with the FTP estimator and set a realistic ceiling. Aim to crest the 633 m of gain with something left, not to blow apart at 1480 m.

Gearing

Do not under-gear this one. For a 6.1 km climb averaging 10.38% with ramps of 15.13%, a compact 34-tooth chainring paired with a wide cassette is the sensible minimum. A 34×32 will get most fit riders up, but on the steepest sections it leaves little margin.

If you have the range, a 34×34 is the smarter choice here — that extra sprocket keeps your cadence alive on the 15.13% pitches and protects your knees over the full 633 m of climbing. Given the sustained nature of the gradient, err toward easier gearing than you think you need.

Summary

The Passo di Collerena - Sandbüheljoch is a compact monster: 6.1 km, 10.38% average, and a summit at 1480 m that you reach the hard way. Gear low, pace with discipline, and respect the wall.

Length: 6.1 km
Average gradient: 10.38%
Max gradient: 15.13%
Start: 847 m
Summit: 1480 m
Net gain: 633 m
Total ascent: 617 m
Category: 1